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The price above reflects the weighted average sale price.  The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transactions were effected."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Shares are held by Topol Family Holdings, LLC, with respect to which the reporting person is a manager and maintains voting rights of these shares."}],"balance_after":84562,"source":{"system":"sec-edgar","filing":"0001093557-18-000123","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1093557/000109355718000123/edgardoc.xml","form_type":"4"}},{"id":3909193,"issuer":{"id":3114,"kind":"organization","name":"DEXCOM INC","symbol":"DXCM"},"owners":[{"id":79953,"kind":"person","name":"TOPOL ERIC","position":1,"cik":"0001468345","reported_name":"TOPOL ERIC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2018-06-05T00:02:11.000Z","date":"2018-05-31","kind":"grant","acquired":true,"shares":3695,"price":0.001,"value":3.695,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"Each share is represented by a restricted stock unit (RSU) that represents a contingent right to receive one share of DexCom, Inc. commom stock upon settlement."},{"field":"shares","element":"transactionShares","label":"F2","text":"The RSU Award was granted on May 31, 2018 and 100% of the RSU will vest on the earlier of the one year anniversary of the grant date or the date of DexCom Inc's 2019 Annual Meeting."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Represents 8,348 restricted stock units, 4,653 of which were granted on June 1, 2017 and shall vest on June 1, 2018 and 3,695 of which were granted on May 31, 2018 and will vest on the earlier of the one year anniversary of the grant date or the date of DexCom Inc's 2019 Annual Meeting."}],"balance_after":8348,"source":{"system":"sec-edgar","filing":"0001093557-18-000114","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1093557/000109355718000114/edgardoc.xml","form_type":"4"}},{"id":4279060,"issuer":{"id":145206,"kind":"organization","name":"MyoKardia, Inc.","symbol":"MYOK"},"owners":[{"id":79953,"kind":"person","name":"TOPOL ERIC","position":1,"cik":"0001468345","reported_name":"TOPOL ERIC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (Right to Buy)","published_at":"2017-06-16T16:11:55.000Z","date":"2017-06-14","kind":"grant","acquired":true,"shares":11000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The shares subject to this option shall vest and become exercisable in 12 equal monthly installments with the first installment on July 14, 2017, such that this option is fully exercisable on June 14, 2018. This option is subject to full acceleration of vesting with respect to all then-unvested shares upon the consummation of a Sale Event (as defined in the issuer's 2015 Stock Option and Incentive Plan)."}],"balance_after":11000,"derivative":{"exercise_price":14,"expiration_date":"2027-06-13","underlying":"Common Stock","underlying_shares":11000},"source":{"system":"sec-edgar","filing":"0000899243-17-016561","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1468345/000089924317016561/doc4.xml","form_type":"4"}},{"id":4293721,"issuer":{"id":3114,"kind":"organization","name":"DEXCOM INC","symbol":"DXCM"},"owners":[{"id":79953,"kind":"person","name":"TOPOL ERIC","position":1,"cik":"0001468345","reported_name":"TOPOL ERIC","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2017-06-06T00:47:12.000Z","date":"2017-06-01","kind":"grant","acquired":true,"shares":4653,"price":0.001,"value":4.653,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Share units are restricted and subject to vesting in one annual installment from the date of grant. 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